public: virtual void insertQuarter() {
std::cout << "You inserted a quarter" << std::endl;
gumballMachine->setState(gumballMachine->getHasQuarterState());
}
void insertQuarter() const {
std::cout << "You inserted a quarter" << std::endl;
_gumballMachine->setState(_gumballMachine->getHasQuarterState());
}